The ST 18-39 Passenger Stair is a towed airport equipment with hydraulic drive for boarding / off boarding passengers from / to aircraft with boarding threshold height between 1800 mm and 3900 mm.

The ST 18-39 Passenger stair features a rear wheel-assisted movement system for an easy approach to the aircraft.

Main Characteristics

Operative Range

1800 to 3900 mm


Mounted on custom-made towable chassis which incorporates , diesel engine, stair section, electric system and associated hydraulics.


Ramp cylinders and outriggers. All cylinders with pilot overcentre valves


Diesel bi-cilindric

Electrical system

12 VDC

Braking system

Mechanic parking brake acting on front wheels when tow bar is up-rised.

Main Options

– Emergency electro-pump

– Fire Extinguisher

– Telescopic Canopy

– Winter kit

– other diesel engine

Additional Options

Available upon request